Emergency-brake.



UNITED STATES PATENT OFFICE.

Marin-WM. iuUEHLHAUsEn, or CLEVELAND,,OHIO, ASSIGNOR T MORRIS s. rowsou,

s or CLEVELAND, orno.

" EMERGENCY-BRAKE.-

I Patented Dec. 6, 1910.

Application filed February 27, 1909. Serial No. 480,373.-

I To all whom it may concern:

and use the same. a

The invention has reference to the class of internal or expanding brakes used in connection with the flanged hub of a wheel such as an automobile wheel. And the objects of the invention are to provide a doubleacting expanding device, whereby strong leverage is obtained diametrically of the flange, and the pressure is equalized thereon to obtain the maximum result of efliciency with great practicability in use. To accomplish these objects the device comprises curvilinear engaging portions which are adapted to simultaneously engage the diametrically opposed inner surfaces of the wheel flange and to make positive contact each with substantially one half of its engaging surface.

Further features of the invention are shown in the pivotal mounting of the semicylindrical members upon a common support whereby they are adapted to automatically adjust themselves to the engaged surface, and in intermediate duplicate cam shaped devices, and connected operating levers therefor, whereby the power required can be obtained in the most eflicient and practical manner.

-The invention further comprises the means for releasing the engaging members, and in the combination and arrangement of parts, hereinafter described, shown in the accompanying drawings, and specifically pointed out in the claims.

In the accompanying drawings Figure 1, is a'longitudinal section of the device, showing the wheel flange, the supporting spider or disk and the expanding brake mechanism, Fig. 2, is a face view of the inner face thereof showing relative position of the wheel flange in dotted lines; Fig. 3, is a perspective view of one of the operating cams, and the lever integral therewith.

In these views, 1 is the shaft, such as an automobile shaft, 2, is the flange upon the wheel hub, 3, is a spider upon the shaft upon which the semicylindrical brake shoes or members l, 4, are centrally pivoted at 5, 5, in the diametrical slots 5, 5, so as to swing freely in all directions. The opposed extremities 6, 6, of these members are flattened and are formed parallel to each other, and between each pair of opposed extremities are shown the cam blocks 7, 7, which are also pivoted in the disk or spider 3, at 8, 8, so as to turn freely. The pivot pin for each cam is extended through the spider 3, and one of them 8 is secured therein by means of a screw threadedportion and a nut 9. To the other pin 8 is secured the arm by means of which the brake isset, and it may be connected with any form of lever accessible to the operator by means of the rod 11. These cam blocks 7 7 ,are pro- 7 vided with arms 12, 12, which for: security duplicated in the other cam. Springs 14, 14, I

withdraw the brake members from contact with the overhanging flange 2, as soon as released. 1

The cams are shown of rectangular shape and with parallel sides, preferably rounded at the corners and with central pivot pins, the effect of which is to exert an equal pressure upon each brake member, the pressure being in opposite directions upon opposed members, and exactly alike for each cam.

Since the amount of expansion is slight, the cam projection need not be great and the power obtained through the levers can therefore be proportionally large.

The pivotal supports for the brake members insure adaptation thereof to wear of the surfaces, and a gripping power of uniform pressure is therefore distributed evenly over the friction surface of the flange.

The parallel sides of the cams and of the opposed extremities of the brake members, insure the precise position of these parts, since when the cams are released they will .return to exact alinement and the brake members will be tightly brought up against the faces of the cams. The engaging corners G of the cams are preferably slightly rounded, but the more nearly rectangular they are the quicker the action obtained thereby.

It is obvious that the principle of opera- 10 vmembers bemg provided with tion is adapted to the employment of any number of brake members and such modications are within the spirit of the invention.

Having described the invention what- I claim as new and desire to secure by Letters Patent is: I 1. In an expanding'brake, the combination with an overhanging -flang'e,of a support provided with diametrically op osite I pivot pins, opposed semicylindrical rake members, ivoted on said pivot pins and diametricaily movable thereon, said brake arallel opposed faces at each end, cam b ocks intermediate between said parallel jaces, pivotal pins for said cam blocks in said support,

an operating arm for one cam blocksecured to the c'orrespondin pivotal pm, levers secured to said cam b ocks, a link connecting said flan e, and

ably secured, said brake members having parallel opposed surfaces at'their extremities, duplicate cams pivoted in said support, duplicate levers secured to said cams, av conne'cting link between said levers, an operating arm for one of said cams, said cams adapted to turnsimultaneously on their pivots, and means for releasing said brake members.

3. In an expanding brake, in combination, a .shaft, an overhanging hub and flange thereon, a disk on said shaft, duplicate curvilinear brake members adapted to engage ivotall said disk intermediate of t eir ends and having radial movement thereon, said brake members having parallel opposed surfaces at their extremities, duplicate cams pivoted in said disk, duplicate operating levers therefor, a connecting link between said levers, an operating arm for one 'of said cams, and duplicate springs for automatically releasing said brake members.

connected with In testimony whereof, I hereunto set my hand this 7th da of Februar 1909.

MARTIN MUE HAUSER, In presence of- Gno. S. Coma,

WM. M. Mormon. 

